Memory: Add scratch allocator doc.

Author: kullingk

doc/Common.md

@@ -38,7 +38,7 @@ You need to manage singe bits and you want to avoid dealing with the OR-, AND- a
 
 void main() {
     TBitField<uint32_t> bitfield(0);
-    
+
     // The first bit is set
     bitfield.setBit(1);
     if (bitfield.getBit(1)) std::cout "First bit is set" << std:endl;
@@ -53,12 +53,12 @@ void main() {
 ### Usecases
 ### Examples
 
-## TSharedPtr 
+## TSharedPtr
 ### Introduction
 ### Usecases
 ### Examples
 
-## Variant 
+## Variant
 ### Introduction
 ### Usecases
 ### Examples

doc/Memory.md

@@ -8,5 +8,34 @@ allocation scheme in all containers.
 ## CPPCore::TPoolAllocator
 This allocator can be use to create an initial pool of object at the program startup. 
 
+## CPPCore::TScratchAllocator
+### Introduction
+The scratch allocator preallocates a memory block which can be used in your program. You do not have to deallocate any of the allocations. 
+This will be done when clearing the allocator. All allocations will be invalidated.
+
+### Usecases
+You need to sove any kind of algorithms. For this you need to work with dynamic allocations, which will be thrown away 
+after finishing your work.
+
+### Examples
+```cpp
+#include <Memroy/TScrachtAllocator.h>
+
+using namespace ::cppcore;
+
+int main() {
+    // Will work
+    ScratchAllocator myAllocator(1024);
+    char *ptr1 = myAllocator.alloc(512);
+    assert(ptr1 != nullptr);
+
+    // Overrange shall get catched
+    char *ptr2 = myAllocator.alloc(600);
+    assert(ptr2 == nullptr);
+
+    return 0;
+}
+```
+
 ## CPPCore::TStackAllocator
 The stack allocator preallocates a memory block which can be used in your program. When deallocating your memory you have to follow the first-in last-out rule.